Chat Clients

Multi-Protocol Clients

Many clients listed here (including Pidgin and all it's forks) support multiple IM networks via libpurple. Number of networks is huge but they (like any multiprotocol clients) usually have very limited/none support of network-specific features.

Microblogging Clients

Pino — simple and fast X11 client for Twitter and Identi.ca. It is compiled to native code, which assures small size and speed, and thanks to use of Vala language it can perfectly integrate into your Gnome or XFCE desktop